烤烟胞质雄性不育杂种农艺性状的遗传分析

Genetic Analysis of Agronomic Traits in Flue-cured Tobacco Cytoplasmic Male Sterile Hybrids

为明确新选育的烤烟胞质雄性不育系农艺性状的遗传效应及杂种优势利用潜力,以3个烤烟胞质雄性不育系和4个推广烤烟品种为材料,配成12个杂种,利用简单加性-显性遗传模型对烤烟株高、有效叶数、叶长、叶宽、叶长宽比、茎围、节距和单叶重农艺性状进行遗传分析。结果表明,8个农艺性状受环境的影响大,遗传率较低;农艺性状主要受显性或加性与环境互作效应控制,株高、叶长、叶宽和叶长宽比的显性效应显著高于加性效应,而有效叶、茎围、节距和单叶重的显性效应和加性效应几乎相当;MsYZ203-6、MsYZ216-1和MsYZ206-9烤烟胞质雄性不育系的重要农艺性状存在较大的显性效应,在配制的组合中有较强的杂种优势表现。

In order to understand the genetic effects and hybrid vigor potential of newly developed flue-cured tobacco cytoplasmic male sterile lines,twelve hybrids crossed among 3 cytoplasmic male sterile lines and 4 flue-cured tobacco varieties were used to determine the genetic effects in economic characters including stem height,leaf quantity,leaf length,leaf width,ratio of leaf length to width,stem girth,pitch and weight of single leaf.The results in the present paper showed that the 8 agronomic traits were largely affected by environment,and all had low heritability.The agronomic traits mainly controlled by interaction of dominance or addiction and environment.Stem height,leaf length,leaf width and ratio of leaf length to width had distinctly larger dominant effects than additive effects,while leaf quantity,stem girth,pitch and weight of single leaf had nearly the same dominant effects as additive effects.The 3 cytoplasmic male sterile lines,MsYZ203-6,MsYZ216-1and MsYZ206-9 with high dominant effects in agronomic traits had strong heterosis in their hybrids.